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Problem: Gears noisy (Noise seems to come from transmission)
Condition
Remedy
1.
Gears
worn - chipped
2.
Splines
worn
3.
Primary gears
worn - chipped
4.
Bearings
worn
5.
Bushing
worn
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing
Problem: Gears noisy (Noise seems to come from secondary bevel gear and final driven shaft)
Condition
Remedy
1.
Drive - driven bevel gears
damaged - worn
2.
Backlash
excessive
3.
Tooth contact
improper
4.
Bearing
damaged
5.
Gears
worn - chipped
6.
Splines
worn
1. Replace gears
2. Adjust backlash
3. Adjust contact
4. Replace bearing
5. Replace gears
6. Replace shaft(s)
Problem: Engine idles poorly
Condition
Remedy
1.
Valve clearance
out of adjustment
2.
Valve seating
poor
3.
Valve guides
defective
4.
Rocker arms - arm shaft
worn
5.
Fuel injector
obstructed
6.
Injector timing
incorrect
1. Adjust clearance
2. Replace - service seats - valves
3. Replace guides
4. Replace arms - shafts
5. Replace fuel injector
6. Time injectors
Problem: Engine runs poorly at high speed
Condition
Remedy
1.
Valve springs
weak
2.
Valves
mistimed
3.
Cams - rocker arms
worn
4.
Air cleaner element
obstructed
5.
Fuel hose
obstructed
6.
Lift pump
defective
7.
Fuel filter
plugged
1. Replace springs
2. Retime valves
3. Replace cams - arms
4. Clean - replace element
5. Clean - replace hose
6. Replace pump
7. Replace filter
Problem: Exhaust smoke dirty or heavy
Condition
Remedy
1.
Oil (in the engine)
overfilled - contaminated
2.
Piston rings - cylinder
worn
3.
Valve guides
worn
4.
Cylinder wall
scored - scuffed
5.
Valve stems
worn
6.
Stem seals
defective
7.
Air cleaner element
obstructed
1. Drain excess oil - replace oil
2. Replace - service rings - cylinder
3. Replace guides
4. Replace - bore engine block
5. Replace valves
6. Replace seals
7. Clean - replace element
Problem: Engine lacks power
Condition
Remedy
1.
Valve clearance
incorrect
2.
Valve springs
weak
3.
Valves
mistimed
4.
Piston ring(s) - cylinder
worn
5.
Valve seating
poor
6.
Rocker arms - shafts
worn
7.
Air cleaner element
obstructed
8.
Oil (in the engine)
overfilled - contaminated
9.
Injector timing
incorrect
10.
Fuel filter
restricted
1. Adjust clearance
2. Replace springs
3. Retime valves
4. Replace - service rings - engine block
5. Repair seats
6. Replace arms - shafts
7. Clean element
8. Drain excess oil - change oil
9. Time injectors
10. Replace fuel filter
Problem: Engine overheats
Condition
Remedy
1.
Air filter
restricted
2.
Oil
low
3.
Fuel
incorrect
4.
Oil pump
defective
5.
Oil circuit
obstructed
6.
Coolant level
low
7.
Fan
malfunctioning
8.
Fan switch
malfunctioning
9.
Thermostat
stuck - closed
10.
Radiator hoses - cap
damaged - obstructed
1. Clean - replace air filter
2. Add oil
3. Drain - replace fuel
4. Replace pump
5. Clean circuit
6. Fill - examine system for leaks
7. Check fan fuse - replace fan
8. Replace fan switch
9. Replace thermostat
10. Clear obstruction - replace hoses
